Read the following passage, then choose the correct answer to questions 26 - 30. Plants supply man with food clothing, and shelter- his most important needs. Many of our most useful medicines are also made (26)_________plants. In addition, plants add beauty and pleasure to our lives. Most people enjoy the smell of flowers, the sight field of waving grain, and the quiet of a forest. Not (27)_______plants are helpful to man. Some species grow in fields and gardens  as weeds that choke off useful plants. Tiny hits of pollen from (28)_______plants cause such (29)_________as asthma and hay fever. Other plants destroy millions of dollars (30)_______of crops yearly. Trả lời câu hỏi dưới đây:___________(28)

Câu hỏi liên quan

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  “Did Bob take the test?”
  “Yes, and ________ he passed it easily.”

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  According to the passage the difficulty in diagnosing allergies to food is due to _____ .

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  According to the article, the Feingold diet is not _______ .

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  The phrase “set oft” in line 17 is closest in meaning to _______ .

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  Đọc đoạn văn sau và chọn phương án đúng (ứng vói A, B, C hoặc D) cho mỗi câu hỏi.

  Scientists do not yet thoroughly understand just how the body of an individual becomes sensitive to a substance that is harmless or even wholesome, for the average person. Milk, wheat, and egg, for example, rank among the most healthful and widely used foods. Yet these foods can cause persons sensitive to them to suffer greatly. At first, the body of the individual is not harmed by coming into contact with the substance. After a varying interval of time, usually longer than a few weeks, the body becomes sensitive to it, and an allergy has begun to develop.

  Sometimes it's hard to figure out if you have a food allergy, since it can show up in so many different ways. Your symptoms could be caused by marry other problems. You may have rashes, hives, joint pains mimicking arthritis, headaches, irritability, or depression. The most common food allergies are to milk, eggs, seafood, wheat, nuts, seeds, chocolate, oranges, and tomatoes. Many of these allergies will not develop if these foods are not fed to an infant until her or his intestines mature at around seven months. Breast milk also tends to be protective. Migraines can be set off by foods containing tyramine, phenathylamine, monosodium glutamate, or sodium nitrate. Common foods which contain these are chocolate aged cheeses, sour cream, red wine, pickled herring, chicken livers, avocados, ripe bananas, cured meats, many Oriental and prepared foods (read the labels!). Some people have been successul in treating their migraines with supplements of B-vitamins, particularly B6 and niacin. Children who are hyperactive may benefit from eliminating food additives, especially colorings, and foods high in salicylates from their diets. A few of these are almonds, green peppers, peaches, tea, grapes. This is the diel made popular by Benjamin Feingold, who has written the book Why your chỉld is Hyperacive. Other researchers have had mixed results when testing whether the diet is effective.

  Trả lời câu hỏi dưới đây:

  The topic of the passage is ________ .

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  Chọn từ (ứng vói A, B, Choặc D) có trọng âm chính nhấn vào âm tiết có vị trí khác vói những từ còn lại.

  Trả lời câu hỏi dưới đây:

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  Chọn từ có âm gạch dưới khác với các âm còn lại.

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  The word “these” in line 26 refers to _________ .

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  Not mentioning the authors name was a serious _________ .

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  Jane is a very ________ student.

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